It depends on what you want to do, just for eb's build 6 SOS and the rest COE. If you want to war as an attack build you'll need loads of Spy Towers. Or go as Hansel till you HLBC then switch to pure spy if you don't have lots of time too war as an attack build.
I'm going to have 42 CoE's and 7 SoS'. Having CoE's gives you 2-3 extra hits per unload which can be helpful. So that's what I recommend.
Chose your own build Here's a few Hansel- this is the most money build however you need a lot of pots and allies to attack having equipment will also help !!!!MUST HAVE MAX ALLIES BONUS!!!! Oaf- Open attack farm this build contains no spies and was useful when PWARS were around this has only attack builds on the land Osf Open secret farm Contains no attack building and still common today but was more seening